Furnace.



E. W. WOODS.

FURNACE.

APPLICATION FILED AuG.6. I9I7.

Patented Feb. 25

2 SHEETS-SHEET1.

E. W., WOODS.

FURNACE.

APPLICATION FILED Aue.6, i911.

2 SHEETS-SHEET 2.

mi@ STATES A,

FURNACE.

Specication of Letters Patent.

Patented Feb. 25, 1919..

Application led August 6, 1917. Serial No. 184,568.

To all whom t may concern: y Be it known that l, Ems'rus W. Woons,

a citizen of the United States of America,

my invention consists in the novel and use residing at Chicago, in the county of Cook and State of illinois, have invented certain new and. useful improvements inv Furnaces, of which the following is a specification.'

My invention relates to improvements 1n hot air furnaces, and the ob]ects of my 1mprovenlent are:

First, to aord an improved construction of hot air furnace; c Second, to provide simple and eiiclent devices whereby to employ more of the heat units in a furnace in the heating and circulation of air through space to be warmed or ventilated; n

Third, the provision of a structure which, in operation, will obviate the accumulation of heat at or near the base of the heating means and the lower part of the inclosuretherefor; y

Fourth, to equip the furnace with a lshield adapted to direct the inflowingl an' against the highly heated surfaces of t constructed and arranged to form an outer relatively cool air space and an inner upwardly extending air passage increasing 1n size from the bottom to the top to form free upward passage of the heated air;. and, fifth, the formation of an air receiving chamber into which atmospheric air and return air from the space to be heated or ventilated are permitted to intermix.

With the above and other objects in View,

ful features and in the novel combination and arrangement of parts, illustrated in the accompanying drawlngs forming a part of this specication, and particularly pointed out in the claims hereunto appended; it being understood that changes, variations and modifications in the details of the invention within the scope of the claims, may be resoed to without departing from the spirit or sacrificing any of the advantages thereof.

By showing and specically describing one embodiment of'my invention l do not intend to restrict the range of equivalents not made necessary by the prior state of this art.

ln the drawings, u

Figure 1 is a vertical central sectlon of gmy assembled invention with parts in elevation,

Fig. 2 is a section on line 2-2 on Fig. 1,

e stove, and y Fig 3 is a sectional view of the lower portion of the furnace, A

Fig 4 is a vertical central sect-ion of a modilication ofthe lower portion of the furnace,

Similar numerals refer to like parts throughout the several views.

Referring to the drawings, 5 designates a building wall having an atmospheric air inlet 6 and a cold or fresh air inlet conduit 7 extends from the said inlet 6 to and communicates with the sheet iron casing or jacket 8 which preferably is made in sections of the width of galvanized sheet iron. rlhe crown 9 has suitably connected therewith pipes l0 to the space to be heated or ventilated. The numeral 11 designates what is termed a return air conduit which at its lower end is attached to rectangular inlet or return air delivery box l2 which is provided with collar 13 and an offen end 14 which communicateswith the interior of the casing 8 at its lower end.

rFhe means for heating includes among other things an ash boX 15, a grate 16, a lire pot 17 and an ash box door 18.

The. shieldor flaring member 19 has a lower tapered portion or collar 20 and an upper attaching flange 21 which is riveted or otherwise secured to the casing 8. rlhe lower portion or collar 20 tapers downwardly and the body portion of the said member is inclined upwardly and outwardly from the collar to the attaching flange and the said shield or flaring member .forms a relatively cool outer air space or wellV between it and the lower portion of the casing 8 and it is adapted to direct the inlowing air against the highly heated surface of the stove and the passage or space between the shield or member and the stove consists of the lower portion 23 and the upper portion 24 formed respectively by the collar 20 and the body portion of the shield or member 19. The increase in size fromy the bottom to the top of the inner passage permits the heated air to pass upward freely and causes a, posiftive movement or circulation fof the air through the said passage and the pipes connected with the spaces between the stove and thel casing 8.

It is important that the parts 19 and 20 be tapered substantially as shown and that the opening at ythe lower end of the collar 20 between it and the outer surface of the ash box be constructed so that the air as it lill@ is heated will not back out of the passage but pass freely upward and produce a positive upward circulation of the air. through the furnace.

The pipe 7 conducts the relatively vcold atmospheric air to the air space vbetween the shield or member 19 and the casing 8 and the return air through the pipe l1 is permitted to mingle with the atmospheric air in the space or well 25. The atmospheric l air travels from the delivery end of the pipe 7 to the lower end of the inner ,passage and as it becomes'heated starts circulation of heated air through the system, the yrate of travel of the heated rareed air depending upon the intensity of the iire. rhe lowei` end of the collar 20 is positioned sufliciently above the Hoor on which the ash box is mounted to permit the upward flow of a sucient volume of air through the portions 23 and 24C and the inner passage. j

llt will be noted that the tapered collar 20 has its front portion cut away to accommodate the front portion of the ash box.

In operation, when heat is present in the heating means and the temperature is higher than that of the air within the casing 8, upward movement of. air is begun by the heating of the air in the upwardly tapered passage. The incoming atmospheric air first enters the air well or space 25 and it is heated inthe portions 23 and 24 of the upwardly tapered passage and caused to travel upwardly.

By showing and describing specifically one embodiment of my invention it is not intended to restrict the range of equivalents not made necessary by the prior state of this art.

memo? In the slightly modified form of disclosure in Fig. 4, the atmospheric air inlet pipe 7 projects somewhat at 26 into the air receiving chamber 28 and similarly the return air box projects at 27 into the chamber 25.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The combination with a furnace having heating means and an outside casing, of a flaring member in air tight relation at its upper end with the 4inner wall of the outside casing and forming therewith an upwardly increasing air passage between an outer wall of the heating means and the inner surface of said Haring member, the lower end of said Haring member extending downwardly somewhat near to the upper surface of the floor of the furnace.

2. rlhe combination with a furnace having heating means and an outside casing, of a Haring member disposed adjacent the heating means and in air tight relation at its upper end with the inner wall of the outside casing and forming therewith an upwardly increasing air passage between anouter wall of the heating means and the inner surface of said flaring member, the lower end of said flaring member extending downwardly nearly to the floor of the furnace and form ing a restricted air passage.

In testimony whereof I ax my signature in the presence of a witness.

ERASTUS W. WODS.

Witness: l

Sco'r'r M. HOGAN. 

